1213010111 has 4 divisors (see below), whose sum is σ = 1216961592. Its totient is φ = 1209058632.

The previous prime is 1213010083. The next prime is 1213010167. The reversal of 1213010111 is 1110103121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1110103121 = 1987 ⋅558683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213010111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213010092 and 1213010101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213013111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1975280 + ... + 1975893.

It is an arithmetic number, because the mean of its divisors is an integer number (304240398).

Almost surely, 2^1213010111 is an apocalyptic number.

1213010111 is a deficient number, since it is larger than the sum of its proper divisors (3951481).

1213010111 is an equidigital number, since it uses as much as digits as its factorization.

1213010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951480.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1213010111 is about 34828.2946898064. The cubic root of 1213010111 is about 1066.4851361762.

Adding to 1213010111 its reverse (1110103121), we get a palindrome (2323113232).

It can be divided in two parts, 1213010 and 111, that added together give a palindrome (1213121).

The spelling of 1213010111 in words is "one billion, two hundred thirteen million, ten thousand, one hundred eleven".